Show some extra generated code in tests

This simply helps me debug a bit better.
Use "chisel-hdrtar" to generate emulator.h
Run flo-llvm on Flo files generated from Chisel

I've now essentially got three tests:

* Torture -> Chisel -> C++
* Torture -> Chisel -> Flo -> LLVM
* Torture -> Flo -> LLVM

that are run for every configuration.
Add a cat test

This one actually exposes a bug in LLVM's optimizer.  Note that the
specific version of the test that fails is commeted out so I can
ensure that everything here passes.